diff --git a/rules/windows/sysmon/sysmon_abusing_azure_browser_sso.yml b/rules/windows/sysmon/sysmon_abusing_azure_browser_sso.yml new file mode 100644 index 000000000..2a25beefd --- /dev/null +++ b/rules/windows/sysmon/sysmon_abusing_azure_browser_sso.yml @@ -0,0 +1,29 @@ +title: Avusing Azure Browser SSO +id: 50f852e6-af22-4c78-9ede-42ef36aa3453 +description: Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user. +author: Den Iuzvyk +reference: + - https://posts.specterops.io/requesting-azure-ad-request-tokens-on-azure-ad-joined-machines-for-browser-sso-2b0409caad30 +date: 2020/07/15 +logsource: + category: sysmon + product: windows +status: experimental +tags: + - attack.defense_evasion + - attack.privilege_escalation + - attack.t1073 +detection: + condition: selection_dll and not filter_legit + selection_dll: + EventID: 7 + ImageLoaded|endswith: MicrosoftAccountTokenProvider.dll + filter_legit: + Image|endswith: + - BackgroundTaskHost.exe + - devenv.exe + - iexplore.exe + - MicrosoftEdge.exe +falsepositives: + - unknown +level: high